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The high end of the luxury real estate market had a great 2012, with real estate records being broken from coast to coast. We combed back through our archives to find the biggest residential real estate transactions reported in the past 12 months. Buyers on our list include tech CEOs, finance moguls, and celebrities.

Ryan Seacrest is looking beyond "American Idol's" end next season and locking down his contract with E!. The producer and television personality has extended his contract with the NBCUniversal-owned cable channel. Specifically, he'll remain the host of its "Live From the Red Carpet" series," according to a network press release.